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Sintering and Mechanical Properties of ZrB 2 –TaSi 2 and HfB 2 –TaSi 2 Ceramic Composites
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Fully dense fine‐grained ZrB
2
‐ and HfB
2
‐based composites contaning 15 vol% TaSi
2
were produced by hot pressing at 1850°–1900°C. Gas formation and mass loss, which occurred during sintering in both systems, were in agreement with thermodynamic predictions. In both composites, the presence of a solid solution formed by the diffusion of tantalum into the boride matrix was observed. The HfB
2
‐based composite was harder (22 GPa), stiffer (528 GPa), and tougher (4.1M Pa·m
1/2
) than the ZrB
2
‐based composite. Although the room‐temperature flexural strength of the ZrB
2
‐based composite (830 MPa) was higher than that of the HfB
2
‐based composite (700 MPa), the opposite was true at 1200° and 1500°C. Contrary to the significant strength decrease observed for the ZrB
2
‐based materials at elevated temperature, the HfB
2
composite retained ∼86% of its room temperature strength up to 1500°C (∼600 MPa).
Title: Sintering and Mechanical Properties of ZrB
2
–TaSi
2
and HfB
2
–TaSi
2
Ceramic Composites
Description:
Fully dense fine‐grained ZrB
2
‐ and HfB
2
‐based composites contaning 15 vol% TaSi
2
were produced by hot pressing at 1850°–1900°C.
Gas formation and mass loss, which occurred during sintering in both systems, were in agreement with thermodynamic predictions.
In both composites, the presence of a solid solution formed by the diffusion of tantalum into the boride matrix was observed.
The HfB
2
‐based composite was harder (22 GPa), stiffer (528 GPa), and tougher (4.
1M Pa·m
1/2
) than the ZrB
2
‐based composite.
Although the room‐temperature flexural strength of the ZrB
2
‐based composite (830 MPa) was higher than that of the HfB
2
‐based composite (700 MPa), the opposite was true at 1200° and 1500°C.
Contrary to the significant strength decrease observed for the ZrB
2
‐based materials at elevated temperature, the HfB
2
composite retained ∼86% of its room temperature strength up to 1500°C (∼600 MPa).
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